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Multi-Way Conventional loudspeakers with crossovers

Dayton DS315-8 12" woofer box
Dayton DS315-8 12" woofer box
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Old 16th April 2019, 05:32 AM   #1
albertli is offline albertli  Canada
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Default Dayton DS315-8 12" woofer box

Hi guys,
I lately was gifted a pair of wood horn with built in drivers and a pair of 12" bass driver - Dayton DS315-8. As of my friend, I only have to build a pair of box for the woofer and it's good to go. The horn's cut off at 400hz.
I'm a complete newbie on speaker design and or crossover design. I'd like to build a pair of 3cu.ft. vented box and tune to 30hz if possible. I love bass, smooth bass. I want the box height around 28-30" so to sit the wood horn right on top. I figure the size around 12"w x 16"D x 28"H but don't know if it is a good reasonable proportion. Please don't hesitate to give any valuable ideas and advices that you can think of.
Thanks in advance
Albert
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Old 15th May 2019, 04:40 PM   #2
albertli is offline albertli  Canada
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I've been cruising around the forums and found some more informations that might be suit to my application. Members suggested to run this speaker in a 1.9 - 2.2 cu.ft ID tuned to 37f3. I come up with the number 11" x 15" x 23" ID = 2.196 cu.ft.
Do I have to add on the speaker displacement and the bracing on top of those numbers?
Regards
Albert
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Old 15th May 2019, 04:57 PM   #3
Mark Tillotson is offline Mark Tillotson
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Normally internal displacement of driver and any port or other hardware are subtracted from the internal volume (its the air that acts as the spring in the resonant system after all). Adding accoustic wadding effectively enlarges the volume a bit though, so you can maybe just assume one will cancel the other roughly.
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Old 15th May 2019, 05:00 PM   #4
albertli is offline albertli  Canada
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Quote:
Originally Posted by Mark Tillotson View Post
Normally internal displacement of driver and any port or other hardware are subtracted from the internal volume (its the air that acts as the spring in the resonant system after all). Adding accoustic wadding effectively enlarges the volume a bit though, so you can maybe just assume one will cancel the other roughly.
Does it mean I just go for the size as is ?
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Old 15th May 2019, 09:58 PM   #5
GM is offline GM  United States
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Not necessarily since the amount of stuffing required may roll off the bass too much: Sub Box Polyester Fiberfill

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Old 15th May 2019, 11:44 PM   #6
LineSource is offline LineSource  United States
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Quote:
Originally Posted by albertli View Post
Hi guys,
I figure the size around 12"w x 16"D x 28"H
The horn's cut off at 400hz.
Albert
The metal frame diameter of the DS315 is 12.4"
You probably mixed D&W: 12"D x 16"W x 28"H

What are the dimensions of your horn?
---Do you have measurements / spec-sheet?
Typically, -F3 = 400Hz horns are wider than 16".
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Old 16th May 2019, 12:44 AM   #7
albertli is offline albertli  Canada
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Quote:
Originally Posted by GM View Post
Not necessarily since the amount of stuffing required may roll off the bass too much: Sub Box Polyester Fiberfill

GM
Thanks GM for the link
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Old 16th May 2019, 01:01 AM   #8
albertli is offline albertli  Canada
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Quote:
Originally Posted by LineSource View Post
The metal frame diameter of the DS315 is 12.4"
You probably mixed D&W: 12"D x 16"W x 28"H

What are the dimensions of your horn?
---Do you have measurements / spec-sheet?
Typically, -F3 = 400Hz horns are wider than 16".
LineSource,
Happy to have you here. You knows this driver and did recommended this to couple members within this forum.
The synergy horn I talked about was designed by Bill Waslo of which I finished couple years ago. The reason I build this bass box is I can't find the woofers that he used for this design. I just put a 15" Bass with a bit Eq. But don't find I am in the right track. I really would like to run all this with one power amp.
The synergy horn is 93/94 dB and the horn's width is 22". I know the 315-8 is 90dB. I might need a bit of boost but don't know how I can achieve this.
Regards
Albert
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Old 16th May 2019, 01:15 AM   #9
albertli is offline albertli  Canada
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Sorry I forgot the picture
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Old 16th May 2019, 01:30 AM   #10
ICG is offline ICG  Germany
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The Dayton DS315-8 got a Qts of 0,31. That means, in a sealed enclosure it won't go deep, that's a typical BR driver. If you use enough polyester wadding to actually achieve virtual volume increase, your bassreflex port will hardly work anymore. The minimum usable BR enclosure size for the DS315 is around 50l, 60l would be better (sry, won't convert and calculate the measurements into imperial units, too tired).
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